
<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8" />
    <style>
        * {
            margin: 0;
            padding: 0;
            overflow: hidden;
        }

        body,
        #box {
            width: 100%;
            height: 100vh;
        }
    </style>
</head>

<body>
    <div id="box"></div>
    <script type="importmap">
        {
            "imports": {
                "three": "./three/build/three.module.js",
                "three/addons/": "./three/examples/jsm/"
            }
        }
    </script>


    <script type="module">
        import * as THREE from 'three'
        import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
        import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js'
        import { DRACOLoader } from 'three/addons/loaders/DRACOLoader.js'

        const box = document.getElementById('box')
        const scene = new THREE.Scene()
        // 相机
        const camera = new THREE.PerspectiveCamera(75, box.clientWidth / box.clientHeight, 0.1, 1000)
        camera.position.set(5, 5, 5)
        // 渲染器
        const renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true, logarithmicDepthBuffer: true })
        // 环境光
        scene.add(new THREE.AmbientLight(0xffffff, 4))
        // 参考线
        scene.add(new THREE.AxesHelper(1000))


        // 加载模型 gltf/ glb 
        const loader = new GLTFLoader()
        loader.load('./zhanji.glb', (gltf) => {

            scene.add(gltf.scene)
            gltf.scene.scale.set(0.005, 0.005, 0.005)

            // 包围盒本身是虚拟的，本身不存在可视化能力
            const box3 = new THREE.Box3();
            box3.expandByObject(gltf.scene);
            console.log('查看包围盒', box3);

            const size = new THREE.Vector3()
            box3.getSize(size)
            console.log('模型包围盒尺寸', size);

            const center = new THREE.Vector3()
            box3.getCenter(center)
            console.log('模型中心坐标', center);

            const boxGeometry = new THREE.BoxGeometry(size.x, size.y, size.z);
            const material = new THREE.MeshBasicMaterial({ color: 0xff0000, wireframe: true }); // 红色，线框模式
            const box = new THREE.Mesh(boxGeometry, material);
            box.position.copy(center);  //拷贝位置
            scene.add(box);

        })

        renderer.setSize(box.clientWidth, box.clientHeight)
        box.appendChild(renderer.domElement)
        new OrbitControls(camera, renderer.domElement)

        animate()
        function animate() {
            requestAnimationFrame(animate)
            renderer.render(scene, camera)
        }

    </script>

</body>

</html>